<template>
  <h2 v-if="firstView">请输入用户名搜索</h2>
  <h2 v-else-if="loading">LOADING...</h2>
  <h2 v-else-if="errorMsg">{{errorMsg}}</h2>
  <div v-else class="row">
    <div class="card" v-for="(user, index) in users" :key="index">
      <a :href="user.url" target="_blank">
        <img :src="user.avatar_url" style='width: 100px'/>
      </a>
      <p class="card-text">{{user.name}}</p>
    </div>
  </div>
</template>

<script>
import PubSub from 'pubsub-js'
import axios from 'axios'
export default {
  data () {
    return {
      firstView: true,
      loading: false,
      users: null, // [{url: '',avatar_url: '',name: ''}]
      errorMsg: ''
    }
  },
  mounted () {
    // 是否在此发ajax请求 不是， 而是在点击search之后
    // 订阅搜索的消息
    PubSub.subscribe('search', (msg, searchName) => { // 说明发生ajax请求进行搜索
      const url = `https://api.github.com/search/users?q=${searchName}`

      // 更新状态(请求中)
      this.firstView = false
      this.loading = true
      this.users = null
      this.errorMsg = ''
      // 发生ajax请求
      axios.get(url).then(response => {
        const result = response.data
        const users = result.items.map(item => ({
          url: item.html_url,
          avatar_url: item.avatar_url,
          name: item.login
        }))
        // 成功,更新状态(成功)
        this.loading = false
        this.users = users
      }).catch(error => {
        if (error) {
          // 失败，更新状态(成功)
          this.loading = false
          this.errorMsg = '请求失败'
        }
      })
    })
  }
}
</script>

<style scoped>
  .card {
    float: left;
    width: 33.333%;
    padding: .75rem;
    margin-bottom: 2rem;
    border: 1px solid #efefef;
    text-align: center;
  }

  .card > img {
    margin-bottom: .75rem;
    border-radius: 100px;
  }

  .card-text {
    font-size: 85%;
  }

</style>
